Sometimes I just feel like quitting, but then I think about all the people I’d be letting down.

教学的艺术在很大程度上在于唤醒年轻心灵的自然好奇心，并用知识的营养来满足它。

If you can’t get a miracle, become one.

The only limit to your impact is your imagination and commitment.

面包师的手是他最重要的工具。